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Hypoxia inducible factor 1

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https://www.readbyqxmd.com/read/29149745/household-air-pollution-and-chronic-hypoxia-in-the-placenta-of-pregnant-nigerian-women-a-randomized-controlled-ethanol-cookstove-intervention
#1
Anindita Dutta, Galina Khramstova, Katherine Brito, Donee Alexander, Ariel Mueller, Sireesha Chinthala, Damilola Adu, Tope Ibigbami, John Olamijulo, Abayomi Odetunde, Kehinde Adigun, Liese Pruitt, Ian Hurley, Olufunmilayo Olopade, Oladosu Ojengbede, Sarosh Rana, Christopher O Olopade
BACKGROUND: Household air pollution (HAP) is associated with adverse pregnancy outcomes. OBJECTIVES: Investigate impact of in-utero HAP exposure on placental development and chronic hypoxia. METHODS: Markers of chronic placental hypoxia [Hofbauer cells (HBC), syncytial knots (SK), chorionic vascular density (cVD) and hypoxia-inducible factor (HIF)] were stained by hematoxylin-eosin and/or immunohistochemically in placenta samples collected from firewood-/kerosene-users (A,n=16), and ethanol-users (B,n=20) that participated in a randomized controlled intervention trial in Ibadan, Nigeria...
November 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29149667/tumor-acidosis-and-hypoxia-differently-modulate-the-inflammatory-program-measurements-in-vitro-and-in-vivo
#2
Anne Riemann, Sarah Reime, Oliver Thews
Inflammatory mediators produced by the tumor cells are of importance for immune response but also for malignant progression. The aim of the study was to analyze the expression of monocyte chemoattractant protein-1, interleukin-6 (IL-6), tumor necrosis factor-α, inducible isoform of nitric oxide synthase (iNOS), cyclooxygenase-2, and osteopontin in vitro in two different tumor cell lines under hypoxia (pO2≈1.5 mmHg) and/or acidosis (pH=6.6) for up to 24 hours since hypoxia and acidosis are common characteristics of solid tumors...
November 14, 2017: Neoplasia: An International Journal for Oncology Research
https://www.readbyqxmd.com/read/29149457/hmgb1-controls-liver-cancer-initiation-through-yap-dependent-aerobic-glycolysis
#3
Ruochan Chen, Shan Zhu, Xue-Gong Fan, Haichao Wang, Michael T Lotze, Herbert J Zeh, Timothy R Billiar, Rui Kang, Daolin Tang
Emerging studies have suggested that the Hippo pathway is involved in the tumorigenesis of hepatocellular carcinoma (HCC). However, the key regulator of the Hippo pathway in liver tumor metabolic reprogramming remains elusive. Here, we provide evidence to support that high mobility group box 1 (HMGB1), a chromosomal protein, plays a role in the regulation of the Hippo pathway during liver tumorigenesis. Cre/loxP recombination-mediated HMGB1 depletion in hepatocytes blocks diethylnitrosamine-induced liver cancer initiation in mice, whereas shRNA-mediated gene silencing of HMGB1 inhibits HCC cell proliferation...
November 17, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/29149426/relationship-between-lat1-expression-and-resistance-to-chemotherapy-in-pancreatic-ductal-adenocarcinoma
#4
Bolag Altan, Kyoichi Kaira, Akira Watanabe, Norio Kubo, Pinjie Bao, Gantumur Dolgormaa, Erkhem-Ochir Bilguun, Kenichiro Araki, Yoshikatsu Kanai, Takehiko Yokobori, Tetsunari Oyama, Masahiko Nishiyama, Hiroyuki Kuwano, Ken Shirabe
PURPOSE: L-type amino acid transporter 1 (LAT1) is linked to tumor cell proliferation, angiogenesis, and survival in various human cancers. Although the expression of LAT1 was identified as a significant prognostic predictor after surgery in patients with pancreatic ductal adenocarcinoma (PDAC), little is known about the clinical significance of LAT1 as a chemotherapeutic resistance factor in PDAC. METHODS: A total of 110 patients with surgically resected PDAC were retrospectively reviewed as the training set...
November 17, 2017: Cancer Chemotherapy and Pharmacology
https://www.readbyqxmd.com/read/29147618/programmed-cell-death-ligands-expression-in-phaeochromocytomas-and-paragangliomas-relationship-with-the-hypoxic-response-immune-evasion-and-malignant-behavior
#5
David J Pinato, James R Black, Sebastian Trousil, Roberto E Dina, Pritesh Trivedi, Francesco A Mauri, Rohini Sharma
The hypoxic response underlies the pathogenesis and malignant behavior of PCC/PGL. Regulation of PD-1 receptor-ligand signaling, a therapeutically actionable driver of the anti-tumor immune response, is a hypoxic-driven trait across malignancies. We evaluated the prognostic role of PD ligands in association with biomarkers of hypoxia and angiogenesis in patients with PCC/PGL. Tissue microarrays sections including consecutive cases diagnosed between 1983-2011 were stained for PD-L1 and 2, hypoxia inducible factor 1a (Hif-1a), Carbonic Anhydrase IX (CaIX), Vascular Endothelial Growth Factor-A (VEGF-A)...
2017: Oncoimmunology
https://www.readbyqxmd.com/read/29146180/chlorogenic-acid-attenuates-diabetic-retinopathy-by-reducing-vegf-expression-and-inhibiting-vegf-mediated-retinal-neoangiogenesis
#6
Xiyu Mei, Lingyu Zhou, Tianyu Zhang, Bin Lu, Yuchen Sheng, Lili Ji
Diabetic retinopathy (DR) is one of the most common and serious complications of diabetes mellitus (DM). This study aims to investigate the amelioration of chlorogenic acid (CGA) on proliferative DR (PDR) via focusing on inhibiting retinal neoangiogenesis. CGA reduced the increased cell proliferation, migration and tube formation induced by vascular endothelial growth factor (VEGF) in human retinal endothelial cells (HREC) and choroid-retinal endothelial RF/6A cells. CGA abrogated VEGF-induced the phosphorylation of VEGFR2 and its downstream mitogen-activated extracellular regulated kinase (MEK1/2), extracellular regulated protein kinase (ERK1/2) and p38 kinase...
November 13, 2017: Vascular Pharmacology
https://www.readbyqxmd.com/read/29145148/honokiol-protects-pancreatic-%C3%AE-cell-against-high-glucose-and-intermittent-hypoxia-induced-injury-by-activating-nrf2-are-pathway-in-vitro-and-in-vivo
#7
Chen-Guang Li, Chang-Lin Ni, Min Yang, Yun-Zhao Tang, Zhu Li, Yan-Juan Zhu, Zhen-Huan Jiang, Bei Sun, Chun-Jun Li
Obstructive sleep apnea hypopnea syndrome (OSAHS) is associated with glucose intolerance, insulin resistance and type 2 diabetes mellitus (T2DM). Although several studies have revealed that intermittent hypoxia (IH) in OSAHS may further aggravate pancreatic β cell damage and promote the evolution of type 2 diabetes (T2DM) by increasing oxidative stress, the underlying mechanisms are unclear. Honokiol, a potent radical scavenger, has been demonstrated to ameliorate oxidative stress in many cases. The present study aimed to explore the potential mechanism of IH and diabetes synergistically damage and destruct the pancreatic β cell, examine the effects of honokiol on ameliorating pancreatic β cell injury in this context and explore the mechanism of such effects...
November 13, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29144820/pheochromocytoma-a-genetic-and-diagnostic-update
#8
Leilani B Mercado-Asis, Katherine I Wolf, Ivana Jochmanova, David Taïeb
OBJECTIVE: Pheochromocytomas and paragangliomas (PPGLs) are neuroendocrine tumors derived from adrenal or extra-adrenal locations, respectively. Upon suspicion of PPGL, specific metabolomic, molecular, biochemical, imaging, and histopathological studies are performed to prove, localize, treat, and monitor disease progression. Recently, improved diagnostic tools allow physicians to accurately diagnose PPGL, even in patients presenting with small (less than 1 cm) or biochemically silent tumors, which previously delayed proper detection and treatment...
November 16, 2017: Endocrine Practice
https://www.readbyqxmd.com/read/29144447/bcat1-restricts-%C3%AE-kg-levels-in-aml-stem-cells-leading-to-idhmut-like-dna-hypermethylation
#9
Simon Raffel, Mattia Falcone, Niclas Kneisel, Jenny Hansson, Wei Wang, Christoph Lutz, Lars Bullinger, Gernot Poschet, Yannic Nonnenmacher, Andrea Barnert, Carsten Bahr, Petra Zeisberger, Adriana Przybylla, Markus Sohn, Martje Tönjes, Ayelet Erez, Lital Adler, Patrizia Jensen, Claudia Scholl, Stefan Fröhling, Sibylle Cocciardi, Patrick Wuchter, Christian Thiede, Anne Flörcken, Jörg Westermann, Gerhard Ehninger, Peter Lichter, Karsten Hiller, Rüdiger Hell, Carl Herrmann, Anthony D Ho, Jeroen Krijgsveld, Bernhard Radlwimmer, Andreas Trumpp
The branched-chain amino acid (BCAA) pathway and high levels of BCAA transaminase 1 (BCAT1) have recently been associated with aggressiveness in several cancer entities. However, the mechanistic role of BCAT1 in this process remains largely uncertain. Here, by performing high-resolution proteomic analysis of human acute myeloid leukaemia (AML) stem-cell and non-stem-cell populations, we find the BCAA pathway enriched and BCAT1 protein and transcripts overexpressed in leukaemia stem cells. We show that BCAT1, which transfers α-amino groups from BCAAs to α-ketoglutarate (αKG), is a critical regulator of intracellular αKG homeostasis...
November 16, 2017: Nature
https://www.readbyqxmd.com/read/29142464/bmpr2-and-hif1-%C3%AE-overexpression-in-resected-osteosarcoma-correlates-with-distant-metastasis-and-patient-survival
#10
Shidong Wang, Tingting Ren, Yi Huang, Xing Bao, Kunkun Sun, Danhua Shen, Wei Guo
Objective: Bone morphogenetic protein receptor 2 (BMPR2) and hypoxia-inducible factor 1-α (HIF1-α) existed abnormal expression in several types of cancer. However, their expressions and related roles in osteosarcoma are largely unknown. Methods: To investigate the clinical significance of BMPR2 and HIF1-α in osteosarcoma, we analyzed their expression levels in 103 osteosarcoma specimens by immunochemistry. Meanwhile, we conducted a follow-up to examine the metastatic behavior and overall survival (OS) of osteosarcoma patients...
October 2017: Chinese Journal of Cancer Research, Chung-kuo Yen Cheng Yen Chiu
https://www.readbyqxmd.com/read/29138802/in-vitro-investigation-of-the-mechanism-underlying-the-effect-of-ginsenoside-on-the-proliferation-and-differentiation-of-neural-stem-cells-subjected-to-oxygen-glucose-deprivation-reperfusion
#11
Jian Gao, Huajing Bai, Qiang Li, Jian Li, Feng Wan, Mo Tian, Yuanyuan Li, Yilun Song, Jianping Zhang, Yinchu Si
The present study comprised a series of experiments to investigate the mechanism underlying the effect of ginsenoside on the self-renewal, proliferation and differentiation of neural stem cells (NSCs) undergoing oxygen-glucose deprivation/reperfusion (OGD/R) in vitro. The NSCs, which were isolated from the hippocampus of embryonic day 17 embryo rats, were subjected to OGD/R to establish an in vitro model of brain ischemia-reperfusion, following which different doses of ginsenoside were administered to the model...
November 13, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29138796/reactive-oxygen-species-induce-injury-of-the-intestinal-epithelium-during-hyperoxia
#12
Min Zhao, Shimiao Tang, Junchi Xin, Yingliang Wei, Dongyan Liu
Long-term therapeutic hyperoxia may exert serious toxic effects on intestinal epithelial cells in vitro and in vivo. The aim of the present study was to investigate the cause of this intestinal injury under conditions of hyperoxia. Caco-2 cells were treated with different concentrations of hydrogen peroxide (H2O2) and 85% hyperoxia for 24 h. higher rates of injury of Caco-2 cells were observed in the hyperoxia and H2O2 groups compared with the control group. The reactive oxygen species (ROS) level of the hyperoxia group was significantly higher compared with that of the 400 µM H2O2 group...
November 9, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29138682/mir-128-is-implicated-in-stress-responses-by-targeting-mafg-in-skeletal-muscle-cells
#13
Rocco Caggiano, Fabio Cattaneo, Ornella Moltedo, Giovanni Esposito, Cinzia Perrino, Bruno Trimarco, Rosario Ammendola, Raffaella Faraonio
MAFG (v-Maf avian musculoaponeurotic fibrosarcoma oncogene homolog G) is a bZIP-type transcriptional regulator that belongs to the small MAF (sMAFs) protein family. By interacting with other bZIP transcription factors, sMAFs can form homo- and heterodimers governing either repressive or activating transcriptional functions. As heterodimeric partner of Nrf2, MAFG positively influences the ARE-dependent antioxidant/xenobiotic pathways, at least in condition of a correct MAFG:Nrf2 balance. MicroRNAs (miRs) participate to different regulatory networks being involved as fine-tuning regulators of gene expression...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29138005/distinct-hypoxic-regulation-of-preadipocyte-factor-1-pref-1-in-preadipocytes-and-mature-adipocytes
#14
Yunwon Moon, Seongyeol Lee, Bongju Park, Hyunsung Park
Preadipocyte factor-1 (Pref-1) is a secretory soluble protein, which exerts pleiotropic effects on maintenance of cancer stem cell characteristics and commitment of mesenchymal stem cell lineages by inhibiting adipogenesis. Observations that obesity renders the microenvironment of adipose tissues hypoxic and that hypoxia inhibits adipogenesis lead us to investigate whether hypoxia increases the expression of anti-adipogenic Pref-1 in preadipocytes, mature adipocytes, and adipose tissues from obese mouse. In 3T3-L1 preadipocytes, hypoxia induces Pref-1 by a hypoxia-inducible factor 1 (HIF-1)-dependent mechanism accompanied by increase in the levels of the active histone mark, acetylated H3K9/14 (H3K9/14Ac)...
November 11, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29137361/downregulation-of-mir-199a-5p-promotes-prostate-adeno-carcinoma-progression-through-loss-of-its-inhibition-of-hif-1%C3%AE
#15
Jinjing Zhong, Rui Huang, Zhengzheng Su, Mengni Zhang, Miao Xu, Jing Gong, Ni Chen, Hao Zeng, Xueqin Chen, Qiao Zhou
Hypoxia-inducible factor-1 alpha (HIF-1α) plays key roles in cell survival under both hypoxia and normoxia conditions. Regulation of HIF-1α is complex and involves numerous molecules and pathways, including post-transcriptional regulation by microRNAs (miRNAs). Although upregulation of HIF-1α has been shown to promote prostate adenocarcinoma (PCa) progression, the mechanism by which miRNAs modulate HIF-1α in prostate cancer has not been clarified. Here, we show that miR-199a-5p is underexpressed in prostate adenocarcinoma...
October 13, 2017: Oncotarget
https://www.readbyqxmd.com/read/29137326/overexpression-of-carbonic-anhydrase-ix-induces-cell-motility-by-activating-matrix-metalloproteinase-9-in-human-oral-squamous-cell-carcinoma-cells
#16
Jia-Sin Yang, Chiao-Wen Lin, Yi-Hsien Hsieh, Ming-Hsien Chien, Chun-Yi Chuang, Shun-Fa Yang
Oral cancer is a solid malignant tumor that is prone to occur following hypoxia. There are no clear studies showing a link between hypoxia and oral carcinogenesis. Carbonic anhydrase IX (CAIX), which is a hypoxia-induced transmembrane protein, is highly expressed in various types of human cancer. However, the effects of CAIX on the metastasis of human oral cancer cells and the underlying molecular mechanisms have not been clarified. In this study, we observed that CAIX overexpression increased the migratory and invasive abilities of SCC-9 and SAS cells...
October 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/29132470/-effects-of-bone-marrow-mesenchymal-stem-cell-transplantation-on-retinal-neovascularization-in-neonatal-rats-with-oxygen-induced-retinopathy
#17
Qing-Jie Mu, Yue-Hua Zhao, Dan-Dan Cheng, Hai-Yu Wang, Lan-Fen Chen, Yan-Song Zhao, Xiao-Li Wang
OBJECTIVE: To explore the effects of rat bone mesenchymal stem cell (BMSC) transplantation on retinal neovascularization, and to observe the changes of hypoxia-inducible factor-1 alpha (HIF-1α) and vascular endothelial growth factors (VEGF) in rats with oxygen-induced retinopathy (OIR). METHODS: Seventy-two seven-day-old Sprague-Dawley rats were randomly divided into three groups: normal control (CON), model (OIR) and BMSC transplantation. In the BMSC transplantation group, BMSCs were transplanted 5 days after oxygen conditioning...
November 2017: Zhongguo Dang Dai Er Ke za Zhi, Chinese Journal of Contemporary Pediatrics
https://www.readbyqxmd.com/read/29130959/ginsenoside-rg1-protects-cardiomyocytes-against-hypoxia-reoxygenation-injury-via-activation-of-nrf2-ho-1-signaling-and-inhibition-of-jnk
#18
Qianhui Li, Yin Xiang, Yu Chen, Yong Tang, Yachen Zhang
BACKGROUND/AIMS: Excessive reactive oxygen species (ROS) disturb the physiology of H9c2 cells, which is regarded as a major cause of H9c2 cardiomyocyte apoptosis. Ginsenoside Rg1 is the main active extract of ginseng, which has important antioxidant properties in various cell models. This project investigated the role of ginsenoside Rg1 in hypoxia/reoxygenation (H/R)-induced oxidative stress injury in cultured H9c2 cells to reveal the underlying signaling pathways. METHODS: H9c2 cells were pretreated with ginsenoside Rg1 for 12 h before exposure to H/R...
November 3, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29130678/-expression-of-lox-in-colorectal-cancer-tissues-and-its-relationship-with-progress-and-prognosis
#19
Xiao-Ming Shi, Wei Zhao, Yong-Bin Yang, Bo-Nan Lü
OBJECTIVE: To analyze the expression of lysyl oxidase (LOX) in colorectal cancer and its relationship with clinicopathological characteristics, prognosis, and its progress. METHODS: 82 cases of colorectal tumor paraffin-embedded specimens and paired tumor-adjacent tissues were collected, and data of clinicopathological characteristics and prognosis of these patients were also recorded from 2009.1 to 2010.5. Expressions of LOX, hypoxia inducible factor-1α (HIF-1α), matrix metalloproteinase (MMP)-2, MMP-7 were determined by immunohistochemistry...
July 2017: Sichuan da Xue Xue Bao. Yi Xue Ban, Journal of Sichuan University. Medical Science Edition
https://www.readbyqxmd.com/read/29130103/hypoxia-induced-inhibition-of-the-endocannabinoid-system-in-glioblastoma-cells
#20
Naotoshi Sugimoto, Hiroaki Ishibashi, Hiroyuki Nakamura, Akihiro Yachie, Takako Ohno-Shosaku
The endocannabinoid system plays an important role in the regulation of physiological and pathological conditions, including inflammation and cancer. Hypoxia is a fundamental phenomenon for the establishment and maintenance of the microenvironments in various physiological and pathological conditions. However, the influence of hypoxia on the endocannabinoid system is not fully understood. In the present study, we investigated the effects of hypoxia on the endocannabinoid system in malignant brain tumors. We subjected U-87 MG cells, derived from malignant glioblastoma, to hypoxia (1...
December 2017: Oncology Reports
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